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Re: [Qemu-devel] [PATCH] hw/arm/virt: fix psci conduit in acpi when el3

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH] hw/arm/virt: fix psci conduit in acpi when el3 enabled
Date: Mon, 25 Jun 2018 10:06:11 +0100

On 25 June 2018 at 05:06, Hongbo Zhang <address@hidden> wrote:
> Hi Peter,
> Yes, your considerations reasonable.
> But in practice of hardware platforms, programmer checks that Arm TF
> is using SMC for PSCI call conduit, then fix it manually in the ACPI
> table, reason may be that Arm TF is lack of ACPI support, if device
> tree used, there should be no such thing because Arm TF can support
> it.
> On QEMU, I just mimic the situation, if a complete reasonable
> solution, further efforts are needed to figure it out.

I'm afraid I don't really understand what you're saying
here. Could you try rephrasing it?

If we're running at EL3 and booting firmware, then QEMU doesn't
provide PSCI. The firmware we're booting is the only thing that
can know if that firmware has implemented PSCI. So only it can
decide whether the ACPI tables and DTB should say that PSCI is

-- PMM

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